Sonca was a C1 tropical cyclone that formed in the Philippine Sea in 2005. The storm reached maximum sustained winds of 167 km/h (90 kt) with a minimum central pressure of 935 hPa. Tracking across the Philippine Seain the Western Pacific basin (, it potentially affected the Philippines, Taiwan and Japan. The storm traveled from approximately 6.9°130.8° to 26.1°150.8°, crossing a range of 19 latitude and 20 longitude.